US Bridges

12th Street over Grand Canal

Fair

Maricopa County, Arizona · .4 MI N Ind.Sch.Rd · Structure no. 08493

Built
1965
60 years old
Condition
Fair
inspected January 2024
Type
Slab
Concrete Continuous
Length
72 ft
2 main spans
Daily traffic
9,842
2019 count
Owner
City
City or Municipal Highway Agency

About this bridge

12th Street over Grand Canal is a concrete continuous slab carrying 12th Street over Grand Canal in Maricopa County, Arizona. It was built in 1965, so it is 60 years old, older than the Arizona average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 9,842 vehicles a day, roughly 3% of them trucks, projected to reach 9,852 by 2039. The structure is 72 ft (21.9 m) long and 52 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
Carries12th Street
CrossesGrand Canal
Location.4 MI N Ind.Sch.Rd
RouteCity Street 0
CountyMaricopa County
StateArizona
Coordinates33.4998, -112.0563
Functional classUrban Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating55.6 US tons
Inventory rating33.3 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length72 ft (21.9 m)
Longest span34 ft (10.4 m)
Deck width52 ft (15.9 m)
Roadway width40 ft (12.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,842 (2019)
Projected traffic9,852 by 2039
Trucks3%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$1,000 (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was 12th Street over Grand Canal built?

It was built in 1965, making it 60 years old in 2025.

What condition is 12th Street over Grand Canal in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in January 2024.

How much traffic does 12th Street over Grand Canal carry?

About 9,842 vehicles per day (2019 count), of which roughly 3% are trucks.

How long is 12th Street over Grand Canal?

The structure is 72 ft (21.9 m) long with a longest span of 34 ft (10.4 m) and a deck 52 ft wide.

Who owns 12th Street over Grand Canal?

It is owned by the City or Municipal Highway Agency.